Hotend specs?

[fredsterrr]

(Posted first in Discussions but no reply)

I replaced my hotend as the old one was faulty, I got a 12v 40w one but now it heats, but not hot enough. It gets to about 150deg and then stops, after a minute or so it then triggers the thermal runaway protection.

I'm guessing I got the wrong voltage or wattage, can someone please tell me what spec hotend the firmware is designed to work with so I can buy the correct one?

Thanks.

[luc-github]

I remember it was 12V but I do not have system anymore , if you changed the hothend do it means you changed the thermistor ?because your issue is more likely that

[fredsterrr]

Yes I did change the thermistor, but I think that's working properly. It reads room temperature correctly, and when I heat it up to 150 then use manual g-code to force filament through, it doesn't extrude any filament. I also have a cheap infrared thermometer which shows a very similar temperature on the hotend, to what the thermistor shows.

I still have all the files on my computer from when I flashed the printer, is there any way I can open these up and read the settings manually? Where would I need to look?

[luc-github]

if you change thermistor that may be the problem as I wrote - you think is reflect the right temperature, but it is not, the curve is not linear : https://github.com/luc-github/Repetier-Firmware-4-Davinci/discussions/104

Another possible reason is you actually use 24V heat cartrige instead of 12V one, so it won't heat enough, and finally last possibility : you have a extruder fan that is too strong or not properly set and cool the nozzle instead of the core of extruder

In all cases, solution is not in settings, unless you change thermistor table / because of your thermistor, and also rework your board as mentioned in FAQ

[fredsterrr]

Ok thanks Luc.